STRESS CORROSION CRACKING SUSCEPTIBILITY INDEX, ISCC, OF S2205 DUPLEX STAINLESS STEEL IN MARINE ENVIRONMENT
The 22％Cr - 5％Ni, ferritic-austenitic duplex stainless steels (DSS) have potential to offer trouble free service in a variety of corrosive media, which, combined with their high strengthto- mass ratio, allows for savings to be made both in terms of structural weight and maintenance costs. However, a number of service failures have been reported, and there remains a cloud over the mechanism of stress corrosion cracking (SCC), which is the most prominent form of failure in offshore applications. In this study, the mechanism of stress corrosion cracking of S2205 duplex stainless steel was investigated in neutral artificial 33.33 ％wt sea-salt solution at strain rate of 1.5 x 10-6 s-1, between the ambient temperature and 80oC. Slow strain rate tests were carried out at open circuit potential and applied austenitepassive potentials at respective temperatures. The fractured surfaces were examined and the test data were analyzed to verify the susceptibility, as well as understanding the mechanism of stress corrosion cracking. Fractographical examination revealed that pitting corrosion assisted the initiation and selective dissolution was involved in the propagation of SCC of cold-drawn S2205 DSS in solution temperatures above 50oC.
Michael Adegbite
Department of Welding Engineering and Offshore Technology, Petroleum Training Institute, Nigeria.
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）